Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / SafeReversePInvokeHandle.cs / 1305600 / SafeReversePInvokeHandle.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: // A safe way to deal with unmanaged MIL interface pointers. //--------------------------------------------------------------------------- using System; using System.IO; using System.Security; using System.Security.Permissions; using System.Collections; using System.Reflection; using MS.Internal; using MS.Win32; using System.Diagnostics; using System.Windows.Media; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using Microsoft.Win32.SafeHandles; using Microsoft.Internal; using UnsafeNativeMethods=MS.Win32.PresentationCore.UnsafeNativeMethods; namespace System.Windows.Media { internal class SafeReversePInvokeWrapper : SafeHandleZeroOrMinusOneIsInvalid { ////// Use this constructor if the handle isn't ready yet and later /// set the handle with SetHandle. SafeMILHandle owns the release /// of the handle. /// ////// Critical: This derives from a class that has a link demand and inheritance demand /// TreatAsSafe: Ok to call constructor /// [SecurityCritical] internal SafeReversePInvokeWrapper() : base(true) { } ////// Use this constructor if the handle exists at construction time. /// SafeMILHandle owns the release of the parameter. /// ////// Calls into native code to wrap a reverse p-invoke delegate into a CReversePInvokeDelegateWrapper. /// [SecurityCritical] internal SafeReversePInvokeWrapper(IntPtr delegatePtr) : base(true) { // Wrap the reverse p-invoke into a reversePInvokeWrapper. IntPtr reversePInvokeWrapper; HRESULT.Check(UnsafeNativeMethods.MilCoreApi.MilCreateReversePInvokeWrapper(delegatePtr, out reversePInvokeWrapper)); SetHandle(reversePInvokeWrapper); } ////// Critical - calls unmanaged code, not treat as safe because you must /// validate that handle is a valid COM object. /// [SecurityCritical] protected override bool ReleaseHandle() { if (handle != IntPtr.Zero) { UnsafeNativeMethods.MilCoreApi.MilReleasePInvokePtrBlocking(handle); } UnsafeNativeMethods.MILUnknown.ReleaseInterface(ref handle); return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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